Tappet mechanism



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OE EARN F OUGH, ENGLAND.

TAEEET MECNISM.

, Application filedj llarch 19, 1924. Serial No. M0333.

-Zo all whom it may concern:

Be it known that I, HERBERT STAYTON HEWITT, a subject of the King of England, residing at Farnborough, Hampshire, England, have invented certain new and'useful Improvements in Tappet Mechanism, of which the following is a specification.

lhis invention relates to tappet mechanism, preferably such as is used on internalthe engaging parts which results in rapid wear, varying the clearance and, by making a groove, rendering correct adjustment of the clearance diflicult. It is the object of the present invention to avoid this in a simple manner.

Accordingly, to the rocker is pivoted about an axis parallel to that of the rocker a shoe or the like having a flat face adapted to engage the flat face of the tappet so as to ave surface contact therewith. a

The shoe preferably takes the form of a parti-spherical member in a socket on the rocker, a flat portion of the member engaging the flat end of the tappet, which moves in a. straight line. In the accompanying drawings, Figure 1 is a side elevation partly in section of a valve rocker of an internal combustion engine to which this invention has been applied in the preferred manner.

Figure 2 is a plan of the same. Like letters indicate like parts throughout the drawings.

In the construction shown in Figures 1 and 2, the top of the valve stem A is flat as usual. The end of the rocker B adjacent the valve stemis drilled through and tapped to receive a screwed plug C which can be adjusted towards and away from the end of the valve stem to adjust the clearance, in the usual manner. Instead of this plug the recess bein Generally there is only a line contact between its fiat face engages the flat face of a engaging the valve stem it is formed on the .underslde with a parti-spherical recess D in which is mounted a part of a sphere E,

edges D are be ow the centre of the sphere and the sphere is held in place. For ex- -ample, these edges maybe spun on .to the sphere after the latter has been fitted.

The flat face 13 on the sphere is adapted to have a surface engagement with the head of the valve stem A, with any suitable clearance, and, to provide lubrication, the top of the plug is recessed at C and a hole C at the bottom of the recess leads oil from the recess on to the face of the sphere.

sufficiently large that the In manufacture, a ball wouldbe-inserted in the recess D in the plug and either before or after insertion one face of the ball would be groundflat Thusthe ball can twist in every direc-.

tion although it is only necessary that it should be capable of oscillation about an axisparallel with the axis of oscillation Z of the rocker.

What I claimas my invention and desireto secure by Letters Patent of the United States is za 1-. In tappet-mechanism the combination of a pivoted rocker, a plug screwed in said rocker, a parti-spherical recess in one end of said plug, a ball formed with a flat face located in said recess, and arranged so that t ppet, substantially as set forth.

2. In tap-pet mechanism, the combination of a rocker, a plug screwed in said rocker,

a partiespherical recess in one end of said plug, a ball formed with a fiat face located in said recess and arranged so that its flat face engages the flat face of a tappet, a recess in said plug, and an oil hole at the bottom of said recess whereby oil collecting in the re- .cess can be conducted tofthe surface of the ball, substantially as set forth.

In testimony whereof I have signed my name to 3 this specification in the presence of two subscribing witnesses. 

